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1134 Chapter 13 Working with Audio
3 Drag the playhead in the Audio Editor left or right. Keep the pointer still to loop
continuously on the frames adjacent to the current frame.
Note: By default, audio scrubbing loops continuously on the 5 frames adjacent to the
current frame when you keep the pointer still. You can turn off looping by choosing
Motion > Preferences, clicking the Project icon, then turning off the “Loop audio while
scrubbing” checkbox under Playback Control.
You can also scrub audio in the Timeline or Keyframe by Option-dragging in the ruler at
the top of the Timeline. You can scrub audio in the mini-Timeline by Option-dragging
the playhead in the mini-Timeline.
Keyframing Level and Pan Changes
Each audio track has curves for both level and pan, and you can add and edit
keyframes to automate level and pan changes over time. This lets you create fade-ins
and fade-outs, drop audio levels for voiceovers and other sound effects, and eliminate
clipping. You edit the curves directly on the audio waveform in the Audio Editor,
allowing you to make accurate edits.
For more information about using keyframes and editing curves, see “Keyframes and
Curves” on page 503.
Recording Keyframes
You can record keyframes for audio level and pan by clicking the Record button, then
moving the sliders in the Audio tab, the HUD, or the Inspector. Recording keyframes for
audio level and pan can be useful for trying out changes, and when you want to hear
the results in real time.
Adding and Editing Keyframes
In the Audio Editor, level curves are displayed as a purple dashed line, and pan curves
are displayed as a blue dashed line. Both curves appear overlaid on top of the audio
waveform. The ranges of level and pan curves are:
 Level curves range from –96 to 6 with 0 equivalent to 0 dB (unity gain).
 Pan curves range from –100 to 100.
The range of values is displayed along the left side of the Audio Editor. Because level
and pan curves each use a different scale, you can only see numerical values for a curve
if the checkbox for that curve is turned on, and the checkbox for the other curve is
turned off.
To add keyframes to a level curve:
1 Turn on the Level checkbox. You may want to turn off the Pan checkbox, so that you
can see the level curve more clearly, and see its numeric values on the left.
2 Option-click the purple level curve to add a keyframe.